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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995 Linus Torvalds
7 * Copyright (C) 1995 Waldorf Electronics
8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
9 * Copyright (C) 1996 Stoned Elipot
10 * Copyright (C) 1999 Silicon Graphics, Inc.
11 * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
12 */
13#include <linux/init.h>
14#include <linux/ioport.h>
15#include <linux/export.h>
16#include <linux/screen_info.h>
17#include <linux/memblock.h>
18#include <linux/initrd.h>
19#include <linux/root_dev.h>
20#include <linux/highmem.h>
21#include <linux/console.h>
22#include <linux/pfn.h>
23#include <linux/debugfs.h>
24#include <linux/kexec.h>
25#include <linux/sizes.h>
26#include <linux/device.h>
27#include <linux/dma-map-ops.h>
28#include <linux/decompress/generic.h>
29#include <linux/of_fdt.h>
30#include <linux/dmi.h>
31#include <linux/crash_dump.h>
32
33#include <asm/addrspace.h>
34#include <asm/bootinfo.h>
35#include <asm/bugs.h>
36#include <asm/cache.h>
37#include <asm/cdmm.h>
38#include <asm/cpu.h>
39#include <asm/debug.h>
40#include <asm/mmzone.h>
41#include <asm/sections.h>
42#include <asm/setup.h>
43#include <asm/smp-ops.h>
44#include <asm/prom.h>
45#include <asm/fw/fw.h>
46
47#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
48char __section(".appended_dtb") __appended_dtb[0x100000];
49#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
50
51struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
52
53EXPORT_SYMBOL(cpu_data);
54
55#ifdef CONFIG_VT
56struct screen_info screen_info;
57#endif
58
59/*
60 * Setup information
61 *
62 * These are initialized so they are in the .data section
63 */
64unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
65
66EXPORT_SYMBOL(mips_machtype);
67
68static char __initdata command_line[COMMAND_LINE_SIZE];
69char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
70
71#ifdef CONFIG_CMDLINE_BOOL
72static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
73#else
74static const char builtin_cmdline[] __initconst = "";
75#endif
76
77/*
78 * mips_io_port_base is the begin of the address space to which x86 style
79 * I/O ports are mapped.
80 */
81unsigned long mips_io_port_base = -1;
82EXPORT_SYMBOL(mips_io_port_base);
83
84static struct resource code_resource = { .name = "Kernel code", };
85static struct resource data_resource = { .name = "Kernel data", };
86static struct resource bss_resource = { .name = "Kernel bss", };
87
88unsigned long __kaslr_offset __ro_after_init;
89EXPORT_SYMBOL(__kaslr_offset);
90
91static void *detect_magic __initdata = detect_memory_region;
92
93#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
94unsigned long ARCH_PFN_OFFSET;
95EXPORT_SYMBOL(ARCH_PFN_OFFSET);
96#endif
97
98void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
99{
100 void *dm = &detect_magic;
101 phys_addr_t size;
102
103 for (size = sz_min; size < sz_max; size <<= 1) {
104 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
105 break;
106 }
107
108 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
109 ((unsigned long long) size) / SZ_1M,
110 (unsigned long long) start,
111 ((unsigned long long) sz_min) / SZ_1M,
112 ((unsigned long long) sz_max) / SZ_1M);
113
114 memblock_add(start, size);
115}
116
117/*
118 * Manage initrd
119 */
120#ifdef CONFIG_BLK_DEV_INITRD
121
122static int __init rd_start_early(char *p)
123{
124 unsigned long start = memparse(p, &p);
125
126#ifdef CONFIG_64BIT
127 /* Guess if the sign extension was forgotten by bootloader */
128 if (start < XKPHYS)
129 start = (int)start;
130#endif
131 initrd_start = start;
132 initrd_end += start;
133 return 0;
134}
135early_param("rd_start", rd_start_early);
136
137static int __init rd_size_early(char *p)
138{
139 initrd_end += memparse(p, &p);
140 return 0;
141}
142early_param("rd_size", rd_size_early);
143
144/* it returns the next free pfn after initrd */
145static unsigned long __init init_initrd(void)
146{
147 unsigned long end;
148
149 /*
150 * Board specific code or command line parser should have
151 * already set up initrd_start and initrd_end. In these cases
152 * perfom sanity checks and use them if all looks good.
153 */
154 if (!initrd_start || initrd_end <= initrd_start)
155 goto disable;
156
157 if (initrd_start & ~PAGE_MASK) {
158 pr_err("initrd start must be page aligned\n");
159 goto disable;
160 }
161 if (initrd_start < PAGE_OFFSET) {
162 pr_err("initrd start < PAGE_OFFSET\n");
163 goto disable;
164 }
165
166 /*
167 * Sanitize initrd addresses. For example firmware
168 * can't guess if they need to pass them through
169 * 64-bits values if the kernel has been built in pure
170 * 32-bit. We need also to switch from KSEG0 to XKPHYS
171 * addresses now, so the code can now safely use __pa().
172 */
173 end = __pa(initrd_end);
174 initrd_end = (unsigned long)__va(end);
175 initrd_start = (unsigned long)__va(__pa(initrd_start));
176
177 ROOT_DEV = Root_RAM0;
178 return PFN_UP(end);
179disable:
180 initrd_start = 0;
181 initrd_end = 0;
182 return 0;
183}
184
185/* In some conditions (e.g. big endian bootloader with a little endian
186 kernel), the initrd might appear byte swapped. Try to detect this and
187 byte swap it if needed. */
188static void __init maybe_bswap_initrd(void)
189{
190#if defined(CONFIG_CPU_CAVIUM_OCTEON)
191 u64 buf;
192
193 /* Check for CPIO signature */
194 if (!memcmp((void *)initrd_start, "070701", 6))
195 return;
196
197 /* Check for compressed initrd */
198 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
199 return;
200
201 /* Try again with a byte swapped header */
202 buf = swab64p((u64 *)initrd_start);
203 if (!memcmp(&buf, "070701", 6) ||
204 decompress_method((unsigned char *)(&buf), 8, NULL)) {
205 unsigned long i;
206
207 pr_info("Byteswapped initrd detected\n");
208 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
209 swab64s((u64 *)i);
210 }
211#endif
212}
213
214static void __init finalize_initrd(void)
215{
216 unsigned long size = initrd_end - initrd_start;
217
218 if (size == 0) {
219 printk(KERN_INFO "Initrd not found or empty");
220 goto disable;
221 }
222 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
223 printk(KERN_ERR "Initrd extends beyond end of memory");
224 goto disable;
225 }
226
227 maybe_bswap_initrd();
228
229 memblock_reserve(__pa(initrd_start), size);
230 initrd_below_start_ok = 1;
231
232 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
233 initrd_start, size);
234 return;
235disable:
236 printk(KERN_CONT " - disabling initrd\n");
237 initrd_start = 0;
238 initrd_end = 0;
239}
240
241#else /* !CONFIG_BLK_DEV_INITRD */
242
243static unsigned long __init init_initrd(void)
244{
245 return 0;
246}
247
248#define finalize_initrd() do {} while (0)
249
250#endif
251
252/*
253 * Initialize the bootmem allocator. It also setup initrd related data
254 * if needed.
255 */
256#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
257
258static void __init bootmem_init(void)
259{
260 init_initrd();
261 finalize_initrd();
262}
263
264#else /* !CONFIG_SGI_IP27 */
265
266static void __init bootmem_init(void)
267{
268 phys_addr_t ramstart, ramend;
269 unsigned long start, end;
270 int i;
271
272 ramstart = memblock_start_of_DRAM();
273 ramend = memblock_end_of_DRAM();
274
275 /*
276 * Sanity check any INITRD first. We don't take it into account
277 * for bootmem setup initially, rely on the end-of-kernel-code
278 * as our memory range starting point. Once bootmem is inited we
279 * will reserve the area used for the initrd.
280 */
281 init_initrd();
282
283 /* Reserve memory occupied by kernel. */
284 memblock_reserve(__pa_symbol(&_text),
285 __pa_symbol(&_end) - __pa_symbol(&_text));
286
287 /* max_low_pfn is not a number of pages but the end pfn of low mem */
288
289#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
290 ARCH_PFN_OFFSET = PFN_UP(ramstart);
291#else
292 /*
293 * Reserve any memory between the start of RAM and PHYS_OFFSET
294 */
295 if (ramstart > PHYS_OFFSET)
296 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
297
298 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
299 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
300 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
301 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
302 }
303#endif
304
305 min_low_pfn = ARCH_PFN_OFFSET;
306 max_pfn = PFN_DOWN(ramend);
307 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
308 /*
309 * Skip highmem here so we get an accurate max_low_pfn if low
310 * memory stops short of high memory.
311 * If the region overlaps HIGHMEM_START, end is clipped so
312 * max_pfn excludes the highmem portion.
313 */
314 if (start >= PFN_DOWN(HIGHMEM_START))
315 continue;
316 if (end > PFN_DOWN(HIGHMEM_START))
317 end = PFN_DOWN(HIGHMEM_START);
318 if (end > max_low_pfn)
319 max_low_pfn = end;
320 }
321
322 if (min_low_pfn >= max_low_pfn)
323 panic("Incorrect memory mapping !!!");
324
325 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
326#ifdef CONFIG_HIGHMEM
327 highstart_pfn = PFN_DOWN(HIGHMEM_START);
328 highend_pfn = max_pfn;
329#else
330 max_low_pfn = PFN_DOWN(HIGHMEM_START);
331 max_pfn = max_low_pfn;
332#endif
333 }
334
335 /*
336 * Reserve initrd memory if needed.
337 */
338 finalize_initrd();
339}
340
341#endif /* CONFIG_SGI_IP27 */
342
343static int usermem __initdata;
344
345static int __init early_parse_mem(char *p)
346{
347 phys_addr_t start, size;
348
349 if (!p) {
350 pr_err("mem parameter is empty, do nothing\n");
351 return -EINVAL;
352 }
353
354 /*
355 * If a user specifies memory size, we
356 * blow away any automatically generated
357 * size.
358 */
359 if (usermem == 0) {
360 usermem = 1;
361 memblock_remove(memblock_start_of_DRAM(),
362 memblock_end_of_DRAM() - memblock_start_of_DRAM());
363 }
364 start = 0;
365 size = memparse(p, &p);
366 if (*p == '@')
367 start = memparse(p + 1, &p);
368
369 if (IS_ENABLED(CONFIG_NUMA))
370 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
371 else
372 memblock_add(start, size);
373
374 return 0;
375}
376early_param("mem", early_parse_mem);
377
378static int __init early_parse_memmap(char *p)
379{
380 char *oldp;
381 u64 start_at, mem_size;
382
383 if (!p)
384 return -EINVAL;
385
386 if (!strncmp(p, "exactmap", 8)) {
387 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
388 return 0;
389 }
390
391 oldp = p;
392 mem_size = memparse(p, &p);
393 if (p == oldp)
394 return -EINVAL;
395
396 if (*p == '@') {
397 start_at = memparse(p+1, &p);
398 memblock_add(start_at, mem_size);
399 } else if (*p == '#') {
400 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
401 return -EINVAL;
402 } else if (*p == '$') {
403 start_at = memparse(p+1, &p);
404 memblock_add(start_at, mem_size);
405 memblock_reserve(start_at, mem_size);
406 } else {
407 pr_err("\"memmap\" invalid format!\n");
408 return -EINVAL;
409 }
410
411 if (*p == '\0') {
412 usermem = 1;
413 return 0;
414 } else
415 return -EINVAL;
416}
417early_param("memmap", early_parse_memmap);
418
419static void __init mips_reserve_vmcore(void)
420{
421#ifdef CONFIG_PROC_VMCORE
422 phys_addr_t start, end;
423 u64 i;
424
425 if (!elfcorehdr_size) {
426 for_each_mem_range(i, &start, &end) {
427 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
428 /*
429 * Reserve from the elf core header to the end of
430 * the memory segment, that should all be kdump
431 * reserved memory.
432 */
433 elfcorehdr_size = end - elfcorehdr_addr;
434 break;
435 }
436 }
437 }
438
439 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
440 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
441
442 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
443#endif
444}
445
446#ifdef CONFIG_KEXEC
447
448/* 64M alignment for crash kernel regions */
449#define CRASH_ALIGN SZ_64M
450#define CRASH_ADDR_MAX SZ_512M
451
452static void __init mips_parse_crashkernel(void)
453{
454 unsigned long long total_mem;
455 unsigned long long crash_size, crash_base;
456 int ret;
457
458 total_mem = memblock_phys_mem_size();
459 ret = parse_crashkernel(boot_command_line, total_mem,
460 &crash_size, &crash_base);
461 if (ret != 0 || crash_size <= 0)
462 return;
463
464 if (crash_base <= 0) {
465 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
466 CRASH_ALIGN,
467 CRASH_ADDR_MAX);
468 if (!crash_base) {
469 pr_warn("crashkernel reservation failed - No suitable area found.\n");
470 return;
471 }
472 } else {
473 unsigned long long start;
474
475 start = memblock_phys_alloc_range(crash_size, 1,
476 crash_base,
477 crash_base + crash_size);
478 if (start != crash_base) {
479 pr_warn("Invalid memory region reserved for crash kernel\n");
480 return;
481 }
482 }
483
484 crashk_res.start = crash_base;
485 crashk_res.end = crash_base + crash_size - 1;
486}
487
488static void __init request_crashkernel(struct resource *res)
489{
490 int ret;
491
492 if (crashk_res.start == crashk_res.end)
493 return;
494
495 ret = request_resource(res, &crashk_res);
496 if (!ret)
497 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
498 (unsigned long)(resource_size(&crashk_res) >> 20),
499 (unsigned long)(crashk_res.start >> 20));
500}
501#else /* !defined(CONFIG_KEXEC) */
502static void __init mips_parse_crashkernel(void)
503{
504}
505
506static void __init request_crashkernel(struct resource *res)
507{
508}
509#endif /* !defined(CONFIG_KEXEC) */
510
511static void __init check_kernel_sections_mem(void)
512{
513 phys_addr_t start = __pa_symbol(&_text);
514 phys_addr_t size = __pa_symbol(&_end) - start;
515
516 if (!memblock_is_region_memory(start, size)) {
517 pr_info("Kernel sections are not in the memory maps\n");
518 memblock_add(start, size);
519 }
520}
521
522static void __init bootcmdline_append(const char *s, size_t max)
523{
524 if (!s[0] || !max)
525 return;
526
527 if (boot_command_line[0])
528 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
529
530 strlcat(boot_command_line, s, max);
531}
532
533#ifdef CONFIG_OF_EARLY_FLATTREE
534
535static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
536 int depth, void *data)
537{
538 bool *dt_bootargs = data;
539 const char *p;
540 int l;
541
542 if (depth != 1 || !data ||
543 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
544 return 0;
545
546 p = of_get_flat_dt_prop(node, "bootargs", &l);
547 if (p != NULL && l > 0) {
548 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
549 *dt_bootargs = true;
550 }
551
552 return 1;
553}
554
555#endif /* CONFIG_OF_EARLY_FLATTREE */
556
557static void __init bootcmdline_init(void)
558{
559 bool dt_bootargs = false;
560
561 /*
562 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
563 * trivial - we simply use the built-in command line unconditionally &
564 * unmodified.
565 */
566 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
567 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
568 return;
569 }
570
571 /*
572 * If the user specified a built-in command line &
573 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
574 * prepended to arguments from the bootloader or DT so we'll copy them
575 * to the start of boot_command_line here. Otherwise, empty
576 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
577 */
578 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
579 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
580 else
581 boot_command_line[0] = 0;
582
583#ifdef CONFIG_OF_EARLY_FLATTREE
584 /*
585 * If we're configured to take boot arguments from DT, look for those
586 * now.
587 */
588 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
589 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
590 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
591#endif
592
593 /*
594 * If we didn't get any arguments from DT (regardless of whether that's
595 * because we weren't configured to look for them, or because we looked
596 * & found none) then we'll take arguments from the bootloader.
597 * plat_mem_setup() should have filled arcs_cmdline with arguments from
598 * the bootloader.
599 */
600 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
601 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
602
603 /*
604 * If the user specified a built-in command line & we didn't already
605 * prepend it, we append it to boot_command_line here.
606 */
607 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
608 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
609 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
610}
611
612/*
613 * arch_mem_init - initialize memory management subsystem
614 *
615 * o plat_mem_setup() detects the memory configuration and will record detected
616 * memory areas using memblock_add.
617 *
618 * At this stage the memory configuration of the system is known to the
619 * kernel but generic memory management system is still entirely uninitialized.
620 *
621 * o bootmem_init()
622 * o sparse_init()
623 * o paging_init()
624 * o dma_contiguous_reserve()
625 *
626 * At this stage the bootmem allocator is ready to use.
627 *
628 * NOTE: historically plat_mem_setup did the entire platform initialization.
629 * This was rather impractical because it meant plat_mem_setup had to
630 * get away without any kind of memory allocator. To keep old code from
631 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
632 * initialization hook for anything else was introduced.
633 */
634static void __init arch_mem_init(char **cmdline_p)
635{
636 /* call board setup routine */
637 plat_mem_setup();
638 memblock_set_bottom_up(true);
639
640 bootcmdline_init();
641 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
642 *cmdline_p = command_line;
643
644 parse_early_param();
645
646 if (usermem)
647 pr_info("User-defined physical RAM map overwrite\n");
648
649 check_kernel_sections_mem();
650
651 early_init_fdt_reserve_self();
652 early_init_fdt_scan_reserved_mem();
653
654#ifndef CONFIG_NUMA
655 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
656#endif
657 bootmem_init();
658
659 /*
660 * Prevent memblock from allocating high memory.
661 * This cannot be done before max_low_pfn is detected, so up
662 * to this point is possible to only reserve physical memory
663 * with memblock_reserve; memblock_alloc* can be used
664 * only after this point
665 */
666 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
667
668 mips_reserve_vmcore();
669
670 mips_parse_crashkernel();
671 device_tree_init();
672
673 /*
674 * In order to reduce the possibility of kernel panic when failed to
675 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
676 * low memory as small as possible before plat_swiotlb_setup(), so
677 * make sparse_init() using top-down allocation.
678 */
679 memblock_set_bottom_up(false);
680 sparse_init();
681 memblock_set_bottom_up(true);
682
683 plat_swiotlb_setup();
684
685 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
686
687 /* Reserve for hibernation. */
688 memblock_reserve(__pa_symbol(&__nosave_begin),
689 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
690
691 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
692}
693
694static void __init resource_init(void)
695{
696 phys_addr_t start, end;
697 u64 i;
698
699 if (UNCAC_BASE != IO_BASE)
700 return;
701
702 code_resource.start = __pa_symbol(&_text);
703 code_resource.end = __pa_symbol(&_etext) - 1;
704 data_resource.start = __pa_symbol(&_etext);
705 data_resource.end = __pa_symbol(&_edata) - 1;
706 bss_resource.start = __pa_symbol(&__bss_start);
707 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
708
709 for_each_mem_range(i, &start, &end) {
710 struct resource *res;
711
712 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
713 if (!res)
714 panic("%s: Failed to allocate %zu bytes\n", __func__,
715 sizeof(struct resource));
716
717 res->start = start;
718 /*
719 * In memblock, end points to the first byte after the
720 * range while in resourses, end points to the last byte in
721 * the range.
722 */
723 res->end = end - 1;
724 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
725 res->name = "System RAM";
726
727 request_resource(&iomem_resource, res);
728
729 /*
730 * We don't know which RAM region contains kernel data,
731 * so we try it repeatedly and let the resource manager
732 * test it.
733 */
734 request_resource(res, &code_resource);
735 request_resource(res, &data_resource);
736 request_resource(res, &bss_resource);
737 request_crashkernel(res);
738 }
739}
740
741#ifdef CONFIG_SMP
742static void __init prefill_possible_map(void)
743{
744 int i, possible = num_possible_cpus();
745
746 if (possible > nr_cpu_ids)
747 possible = nr_cpu_ids;
748
749 for (i = 0; i < possible; i++)
750 set_cpu_possible(i, true);
751 for (; i < NR_CPUS; i++)
752 set_cpu_possible(i, false);
753
754 set_nr_cpu_ids(possible);
755}
756#else
757static inline void prefill_possible_map(void) {}
758#endif
759
760static void __init setup_rng_seed(void)
761{
762 char *rng_seed_hex = fw_getenv("rngseed");
763 u8 rng_seed[512];
764 size_t len;
765
766 if (!rng_seed_hex)
767 return;
768
769 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
770 if (hex2bin(rng_seed, rng_seed_hex, len))
771 return;
772
773 add_bootloader_randomness(rng_seed, len);
774 memzero_explicit(rng_seed, len);
775 memzero_explicit(rng_seed_hex, len * 2);
776}
777
778void __init setup_arch(char **cmdline_p)
779{
780 cpu_probe();
781 mips_cm_probe();
782 prom_init();
783
784 setup_early_fdc_console();
785#ifdef CONFIG_EARLY_PRINTK
786 setup_early_printk();
787#endif
788 cpu_report();
789 check_bugs_early();
790
791#if defined(CONFIG_VT)
792#if defined(CONFIG_VGA_CONSOLE)
793 conswitchp = &vga_con;
794#endif
795#endif
796
797 arch_mem_init(cmdline_p);
798 dmi_setup();
799
800 resource_init();
801 plat_smp_setup();
802 prefill_possible_map();
803
804 cpu_cache_init();
805 paging_init();
806
807 memblock_dump_all();
808
809 setup_rng_seed();
810}
811
812unsigned long kernelsp[NR_CPUS];
813unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
814
815#ifdef CONFIG_DEBUG_FS
816struct dentry *mips_debugfs_dir;
817static int __init debugfs_mips(void)
818{
819 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
820 return 0;
821}
822arch_initcall(debugfs_mips);
823#endif
824
825#ifdef CONFIG_DMA_NONCOHERENT
826static int __init setcoherentio(char *str)
827{
828 dma_default_coherent = true;
829 pr_info("Hardware DMA cache coherency (command line)\n");
830 return 0;
831}
832early_param("coherentio", setcoherentio);
833
834static int __init setnocoherentio(char *str)
835{
836 dma_default_coherent = false;
837 pr_info("Software DMA cache coherency (command line)\n");
838 return 0;
839}
840early_param("nocoherentio", setnocoherentio);
841#endif
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995 Linus Torvalds
7 * Copyright (C) 1995 Waldorf Electronics
8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
9 * Copyright (C) 1996 Stoned Elipot
10 * Copyright (C) 1999 Silicon Graphics, Inc.
11 * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
12 */
13#include <linux/init.h>
14#include <linux/ioport.h>
15#include <linux/export.h>
16#include <linux/screen_info.h>
17#include <linux/memblock.h>
18#include <linux/initrd.h>
19#include <linux/root_dev.h>
20#include <linux/highmem.h>
21#include <linux/console.h>
22#include <linux/pfn.h>
23#include <linux/debugfs.h>
24#include <linux/kexec.h>
25#include <linux/sizes.h>
26#include <linux/device.h>
27#include <linux/dma-contiguous.h>
28#include <linux/decompress/generic.h>
29#include <linux/of_fdt.h>
30#include <linux/of_reserved_mem.h>
31
32#include <asm/addrspace.h>
33#include <asm/bootinfo.h>
34#include <asm/bugs.h>
35#include <asm/cache.h>
36#include <asm/cdmm.h>
37#include <asm/cpu.h>
38#include <asm/debug.h>
39#include <asm/dma-coherence.h>
40#include <asm/sections.h>
41#include <asm/setup.h>
42#include <asm/smp-ops.h>
43#include <asm/prom.h>
44
45#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
46const char __section(.appended_dtb) __appended_dtb[0x100000];
47#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
48
49struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
50
51EXPORT_SYMBOL(cpu_data);
52
53#ifdef CONFIG_VT
54struct screen_info screen_info;
55#endif
56
57/*
58 * Setup information
59 *
60 * These are initialized so they are in the .data section
61 */
62unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
63
64EXPORT_SYMBOL(mips_machtype);
65
66static char __initdata command_line[COMMAND_LINE_SIZE];
67char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69#ifdef CONFIG_CMDLINE_BOOL
70static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
71#endif
72
73/*
74 * mips_io_port_base is the begin of the address space to which x86 style
75 * I/O ports are mapped.
76 */
77unsigned long mips_io_port_base = -1;
78EXPORT_SYMBOL(mips_io_port_base);
79
80static struct resource code_resource = { .name = "Kernel code", };
81static struct resource data_resource = { .name = "Kernel data", };
82static struct resource bss_resource = { .name = "Kernel bss", };
83
84static void *detect_magic __initdata = detect_memory_region;
85
86#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
87unsigned long ARCH_PFN_OFFSET;
88EXPORT_SYMBOL(ARCH_PFN_OFFSET);
89#endif
90
91void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
92{
93 /*
94 * Note: This function only exists for historical reason,
95 * new code should use memblock_add or memblock_add_node instead.
96 */
97
98 /*
99 * If the region reaches the top of the physical address space, adjust
100 * the size slightly so that (start + size) doesn't overflow
101 */
102 if (start + size - 1 == PHYS_ADDR_MAX)
103 --size;
104
105 /* Sanity check */
106 if (start + size < start) {
107 pr_warn("Trying to add an invalid memory region, skipped\n");
108 return;
109 }
110
111 if (start < PHYS_OFFSET)
112 return;
113
114 memblock_add(start, size);
115 /* Reserve any memory except the ordinary RAM ranges. */
116 switch (type) {
117 case BOOT_MEM_RAM:
118 break;
119
120 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
121 memblock_remove(start, size);
122 break;
123
124 default: /* Reserve the rest of the memory types at boot time */
125 memblock_reserve(start, size);
126 break;
127 }
128}
129
130void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
131{
132 void *dm = &detect_magic;
133 phys_addr_t size;
134
135 for (size = sz_min; size < sz_max; size <<= 1) {
136 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
137 break;
138 }
139
140 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
141 ((unsigned long long) size) / SZ_1M,
142 (unsigned long long) start,
143 ((unsigned long long) sz_min) / SZ_1M,
144 ((unsigned long long) sz_max) / SZ_1M);
145
146 add_memory_region(start, size, BOOT_MEM_RAM);
147}
148
149/*
150 * Manage initrd
151 */
152#ifdef CONFIG_BLK_DEV_INITRD
153
154static int __init rd_start_early(char *p)
155{
156 unsigned long start = memparse(p, &p);
157
158#ifdef CONFIG_64BIT
159 /* Guess if the sign extension was forgotten by bootloader */
160 if (start < XKPHYS)
161 start = (int)start;
162#endif
163 initrd_start = start;
164 initrd_end += start;
165 return 0;
166}
167early_param("rd_start", rd_start_early);
168
169static int __init rd_size_early(char *p)
170{
171 initrd_end += memparse(p, &p);
172 return 0;
173}
174early_param("rd_size", rd_size_early);
175
176/* it returns the next free pfn after initrd */
177static unsigned long __init init_initrd(void)
178{
179 unsigned long end;
180
181 /*
182 * Board specific code or command line parser should have
183 * already set up initrd_start and initrd_end. In these cases
184 * perfom sanity checks and use them if all looks good.
185 */
186 if (!initrd_start || initrd_end <= initrd_start)
187 goto disable;
188
189 if (initrd_start & ~PAGE_MASK) {
190 pr_err("initrd start must be page aligned\n");
191 goto disable;
192 }
193 if (initrd_start < PAGE_OFFSET) {
194 pr_err("initrd start < PAGE_OFFSET\n");
195 goto disable;
196 }
197
198 /*
199 * Sanitize initrd addresses. For example firmware
200 * can't guess if they need to pass them through
201 * 64-bits values if the kernel has been built in pure
202 * 32-bit. We need also to switch from KSEG0 to XKPHYS
203 * addresses now, so the code can now safely use __pa().
204 */
205 end = __pa(initrd_end);
206 initrd_end = (unsigned long)__va(end);
207 initrd_start = (unsigned long)__va(__pa(initrd_start));
208
209 ROOT_DEV = Root_RAM0;
210 return PFN_UP(end);
211disable:
212 initrd_start = 0;
213 initrd_end = 0;
214 return 0;
215}
216
217/* In some conditions (e.g. big endian bootloader with a little endian
218 kernel), the initrd might appear byte swapped. Try to detect this and
219 byte swap it if needed. */
220static void __init maybe_bswap_initrd(void)
221{
222#if defined(CONFIG_CPU_CAVIUM_OCTEON)
223 u64 buf;
224
225 /* Check for CPIO signature */
226 if (!memcmp((void *)initrd_start, "070701", 6))
227 return;
228
229 /* Check for compressed initrd */
230 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
231 return;
232
233 /* Try again with a byte swapped header */
234 buf = swab64p((u64 *)initrd_start);
235 if (!memcmp(&buf, "070701", 6) ||
236 decompress_method((unsigned char *)(&buf), 8, NULL)) {
237 unsigned long i;
238
239 pr_info("Byteswapped initrd detected\n");
240 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
241 swab64s((u64 *)i);
242 }
243#endif
244}
245
246static void __init finalize_initrd(void)
247{
248 unsigned long size = initrd_end - initrd_start;
249
250 if (size == 0) {
251 printk(KERN_INFO "Initrd not found or empty");
252 goto disable;
253 }
254 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
255 printk(KERN_ERR "Initrd extends beyond end of memory");
256 goto disable;
257 }
258
259 maybe_bswap_initrd();
260
261 memblock_reserve(__pa(initrd_start), size);
262 initrd_below_start_ok = 1;
263
264 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
265 initrd_start, size);
266 return;
267disable:
268 printk(KERN_CONT " - disabling initrd\n");
269 initrd_start = 0;
270 initrd_end = 0;
271}
272
273#else /* !CONFIG_BLK_DEV_INITRD */
274
275static unsigned long __init init_initrd(void)
276{
277 return 0;
278}
279
280#define finalize_initrd() do {} while (0)
281
282#endif
283
284/*
285 * Initialize the bootmem allocator. It also setup initrd related data
286 * if needed.
287 */
288#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
289
290static void __init bootmem_init(void)
291{
292 init_initrd();
293 finalize_initrd();
294}
295
296#else /* !CONFIG_SGI_IP27 */
297
298static void __init bootmem_init(void)
299{
300 struct memblock_region *mem;
301 phys_addr_t ramstart, ramend;
302
303 ramstart = memblock_start_of_DRAM();
304 ramend = memblock_end_of_DRAM();
305
306 /*
307 * Sanity check any INITRD first. We don't take it into account
308 * for bootmem setup initially, rely on the end-of-kernel-code
309 * as our memory range starting point. Once bootmem is inited we
310 * will reserve the area used for the initrd.
311 */
312 init_initrd();
313
314 /* Reserve memory occupied by kernel. */
315 memblock_reserve(__pa_symbol(&_text),
316 __pa_symbol(&_end) - __pa_symbol(&_text));
317
318 /* max_low_pfn is not a number of pages but the end pfn of low mem */
319
320#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
321 ARCH_PFN_OFFSET = PFN_UP(ramstart);
322#else
323 /*
324 * Reserve any memory between the start of RAM and PHYS_OFFSET
325 */
326 if (ramstart > PHYS_OFFSET)
327 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
328
329 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
330 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
331 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
332 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
333 }
334#endif
335
336 min_low_pfn = ARCH_PFN_OFFSET;
337 max_pfn = PFN_DOWN(ramend);
338 for_each_memblock(memory, mem) {
339 unsigned long start = memblock_region_memory_base_pfn(mem);
340 unsigned long end = memblock_region_memory_end_pfn(mem);
341
342 /*
343 * Skip highmem here so we get an accurate max_low_pfn if low
344 * memory stops short of high memory.
345 * If the region overlaps HIGHMEM_START, end is clipped so
346 * max_pfn excludes the highmem portion.
347 */
348 if (memblock_is_nomap(mem))
349 continue;
350 if (start >= PFN_DOWN(HIGHMEM_START))
351 continue;
352 if (end > PFN_DOWN(HIGHMEM_START))
353 end = PFN_DOWN(HIGHMEM_START);
354 if (end > max_low_pfn)
355 max_low_pfn = end;
356 }
357
358 if (min_low_pfn >= max_low_pfn)
359 panic("Incorrect memory mapping !!!");
360
361 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
362#ifdef CONFIG_HIGHMEM
363 highstart_pfn = PFN_DOWN(HIGHMEM_START);
364 highend_pfn = max_pfn;
365#else
366 max_low_pfn = PFN_DOWN(HIGHMEM_START);
367 max_pfn = max_low_pfn;
368#endif
369 }
370
371
372 /*
373 * In any case the added to the memblock memory regions
374 * (highmem/lowmem, available/reserved, etc) are considered
375 * as present, so inform sparsemem about them.
376 */
377 memblocks_present();
378
379 /*
380 * Reserve initrd memory if needed.
381 */
382 finalize_initrd();
383}
384
385#endif /* CONFIG_SGI_IP27 */
386
387static int usermem __initdata;
388
389static int __init early_parse_mem(char *p)
390{
391 phys_addr_t start, size;
392
393 /*
394 * If a user specifies memory size, we
395 * blow away any automatically generated
396 * size.
397 */
398 if (usermem == 0) {
399 usermem = 1;
400 memblock_remove(memblock_start_of_DRAM(),
401 memblock_end_of_DRAM() - memblock_start_of_DRAM());
402 }
403 start = 0;
404 size = memparse(p, &p);
405 if (*p == '@')
406 start = memparse(p + 1, &p);
407
408 add_memory_region(start, size, BOOT_MEM_RAM);
409
410 return 0;
411}
412early_param("mem", early_parse_mem);
413
414static int __init early_parse_memmap(char *p)
415{
416 char *oldp;
417 u64 start_at, mem_size;
418
419 if (!p)
420 return -EINVAL;
421
422 if (!strncmp(p, "exactmap", 8)) {
423 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
424 return 0;
425 }
426
427 oldp = p;
428 mem_size = memparse(p, &p);
429 if (p == oldp)
430 return -EINVAL;
431
432 if (*p == '@') {
433 start_at = memparse(p+1, &p);
434 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
435 } else if (*p == '#') {
436 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
437 return -EINVAL;
438 } else if (*p == '$') {
439 start_at = memparse(p+1, &p);
440 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
441 } else {
442 pr_err("\"memmap\" invalid format!\n");
443 return -EINVAL;
444 }
445
446 if (*p == '\0') {
447 usermem = 1;
448 return 0;
449 } else
450 return -EINVAL;
451}
452early_param("memmap", early_parse_memmap);
453
454#ifdef CONFIG_PROC_VMCORE
455unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
456static int __init early_parse_elfcorehdr(char *p)
457{
458 struct memblock_region *mem;
459
460 setup_elfcorehdr = memparse(p, &p);
461
462 for_each_memblock(memory, mem) {
463 unsigned long start = mem->base;
464 unsigned long end = start + mem->size;
465 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
466 /*
467 * Reserve from the elf core header to the end of
468 * the memory segment, that should all be kdump
469 * reserved memory.
470 */
471 setup_elfcorehdr_size = end - setup_elfcorehdr;
472 break;
473 }
474 }
475 /*
476 * If we don't find it in the memory map, then we shouldn't
477 * have to worry about it, as the new kernel won't use it.
478 */
479 return 0;
480}
481early_param("elfcorehdr", early_parse_elfcorehdr);
482#endif
483
484#ifdef CONFIG_KEXEC
485static void __init mips_parse_crashkernel(void)
486{
487 unsigned long long total_mem;
488 unsigned long long crash_size, crash_base;
489 int ret;
490
491 total_mem = memblock_phys_mem_size();
492 ret = parse_crashkernel(boot_command_line, total_mem,
493 &crash_size, &crash_base);
494 if (ret != 0 || crash_size <= 0)
495 return;
496
497 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
498 pr_warn("Invalid memory region reserved for crash kernel\n");
499 return;
500 }
501
502 crashk_res.start = crash_base;
503 crashk_res.end = crash_base + crash_size - 1;
504}
505
506static void __init request_crashkernel(struct resource *res)
507{
508 int ret;
509
510 if (crashk_res.start == crashk_res.end)
511 return;
512
513 ret = request_resource(res, &crashk_res);
514 if (!ret)
515 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
516 (unsigned long)((crashk_res.end -
517 crashk_res.start + 1) >> 20),
518 (unsigned long)(crashk_res.start >> 20));
519}
520#else /* !defined(CONFIG_KEXEC) */
521static void __init mips_parse_crashkernel(void)
522{
523}
524
525static void __init request_crashkernel(struct resource *res)
526{
527}
528#endif /* !defined(CONFIG_KEXEC) */
529
530static void __init check_kernel_sections_mem(void)
531{
532 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
533 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
534
535 if (!memblock_is_region_memory(start, size)) {
536 pr_info("Kernel sections are not in the memory maps\n");
537 memblock_add(start, size);
538 }
539}
540
541#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
542#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
543#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
544#define BUILTIN_EXTEND_WITH_PROM \
545 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
546
547/*
548 * arch_mem_init - initialize memory management subsystem
549 *
550 * o plat_mem_setup() detects the memory configuration and will record detected
551 * memory areas using add_memory_region.
552 *
553 * At this stage the memory configuration of the system is known to the
554 * kernel but generic memory management system is still entirely uninitialized.
555 *
556 * o bootmem_init()
557 * o sparse_init()
558 * o paging_init()
559 * o dma_contiguous_reserve()
560 *
561 * At this stage the bootmem allocator is ready to use.
562 *
563 * NOTE: historically plat_mem_setup did the entire platform initialization.
564 * This was rather impractical because it meant plat_mem_setup had to
565 * get away without any kind of memory allocator. To keep old code from
566 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
567 * initialization hook for anything else was introduced.
568 */
569static void __init arch_mem_init(char **cmdline_p)
570{
571 extern void plat_mem_setup(void);
572
573 /*
574 * Initialize boot_command_line to an innocuous but non-empty string in
575 * order to prevent early_init_dt_scan_chosen() from copying
576 * CONFIG_CMDLINE into it without our knowledge. We handle
577 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
578 * content because repeating arguments can be problematic.
579 */
580 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
581
582 /* call board setup routine */
583 plat_mem_setup();
584 memblock_set_bottom_up(true);
585
586#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
587 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
588#else
589 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
590 (USE_DTB_CMDLINE && !boot_command_line[0]))
591 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
592
593 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
594 if (boot_command_line[0])
595 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
596 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
597 }
598
599#if defined(CONFIG_CMDLINE_BOOL)
600 if (builtin_cmdline[0]) {
601 if (boot_command_line[0])
602 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
603 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
604 }
605
606 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
607 if (boot_command_line[0])
608 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
609 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
610 }
611#endif
612#endif
613 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
614
615 *cmdline_p = command_line;
616
617 parse_early_param();
618
619 if (usermem)
620 pr_info("User-defined physical RAM map overwrite\n");
621
622 check_kernel_sections_mem();
623
624 early_init_fdt_reserve_self();
625 early_init_fdt_scan_reserved_mem();
626
627#ifndef CONFIG_NUMA
628 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
629#endif
630 bootmem_init();
631
632 /*
633 * Prevent memblock from allocating high memory.
634 * This cannot be done before max_low_pfn is detected, so up
635 * to this point is possible to only reserve physical memory
636 * with memblock_reserve; memblock_alloc* can be used
637 * only after this point
638 */
639 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
640
641#ifdef CONFIG_PROC_VMCORE
642 if (setup_elfcorehdr && setup_elfcorehdr_size) {
643 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
644 setup_elfcorehdr, setup_elfcorehdr_size);
645 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
646 }
647#endif
648
649 mips_parse_crashkernel();
650#ifdef CONFIG_KEXEC
651 if (crashk_res.start != crashk_res.end)
652 memblock_reserve(crashk_res.start,
653 crashk_res.end - crashk_res.start + 1);
654#endif
655 device_tree_init();
656 sparse_init();
657 plat_swiotlb_setup();
658
659 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
660
661 /* Reserve for hibernation. */
662 memblock_reserve(__pa_symbol(&__nosave_begin),
663 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
664
665 fdt_init_reserved_mem();
666
667 memblock_dump_all();
668
669 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
670}
671
672static void __init resource_init(void)
673{
674 struct memblock_region *region;
675
676 if (UNCAC_BASE != IO_BASE)
677 return;
678
679 code_resource.start = __pa_symbol(&_text);
680 code_resource.end = __pa_symbol(&_etext) - 1;
681 data_resource.start = __pa_symbol(&_etext);
682 data_resource.end = __pa_symbol(&_edata) - 1;
683 bss_resource.start = __pa_symbol(&__bss_start);
684 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
685
686 for_each_memblock(memory, region) {
687 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
688 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
689 struct resource *res;
690
691 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
692 if (!res)
693 panic("%s: Failed to allocate %zu bytes\n", __func__,
694 sizeof(struct resource));
695
696 res->start = start;
697 res->end = end;
698 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
699 res->name = "System RAM";
700
701 request_resource(&iomem_resource, res);
702
703 /*
704 * We don't know which RAM region contains kernel data,
705 * so we try it repeatedly and let the resource manager
706 * test it.
707 */
708 request_resource(res, &code_resource);
709 request_resource(res, &data_resource);
710 request_resource(res, &bss_resource);
711 request_crashkernel(res);
712 }
713}
714
715#ifdef CONFIG_SMP
716static void __init prefill_possible_map(void)
717{
718 int i, possible = num_possible_cpus();
719
720 if (possible > nr_cpu_ids)
721 possible = nr_cpu_ids;
722
723 for (i = 0; i < possible; i++)
724 set_cpu_possible(i, true);
725 for (; i < NR_CPUS; i++)
726 set_cpu_possible(i, false);
727
728 nr_cpu_ids = possible;
729}
730#else
731static inline void prefill_possible_map(void) {}
732#endif
733
734void __init setup_arch(char **cmdline_p)
735{
736 cpu_probe();
737 mips_cm_probe();
738 prom_init();
739
740 setup_early_fdc_console();
741#ifdef CONFIG_EARLY_PRINTK
742 setup_early_printk();
743#endif
744 cpu_report();
745 check_bugs_early();
746
747#if defined(CONFIG_VT)
748#if defined(CONFIG_VGA_CONSOLE)
749 conswitchp = &vga_con;
750#elif defined(CONFIG_DUMMY_CONSOLE)
751 conswitchp = &dummy_con;
752#endif
753#endif
754
755 arch_mem_init(cmdline_p);
756
757 resource_init();
758 plat_smp_setup();
759 prefill_possible_map();
760
761 cpu_cache_init();
762 paging_init();
763}
764
765unsigned long kernelsp[NR_CPUS];
766unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
767
768#ifdef CONFIG_USE_OF
769unsigned long fw_passed_dtb;
770#endif
771
772#ifdef CONFIG_DEBUG_FS
773struct dentry *mips_debugfs_dir;
774static int __init debugfs_mips(void)
775{
776 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
777 return 0;
778}
779arch_initcall(debugfs_mips);
780#endif
781
782#ifdef CONFIG_DMA_MAYBE_COHERENT
783/* User defined DMA coherency from command line. */
784enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
785EXPORT_SYMBOL_GPL(coherentio);
786int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
787
788static int __init setcoherentio(char *str)
789{
790 coherentio = IO_COHERENCE_ENABLED;
791 pr_info("Hardware DMA cache coherency (command line)\n");
792 return 0;
793}
794early_param("coherentio", setcoherentio);
795
796static int __init setnocoherentio(char *str)
797{
798 coherentio = IO_COHERENCE_DISABLED;
799 pr_info("Software DMA cache coherency (command line)\n");
800 return 0;
801}
802early_param("nocoherentio", setnocoherentio);
803#endif